Chuck for jewelers&#39; lathes



CHUCK FOR JEWELERS LATHES Filed May 15, 1922 Patented Sept. is, 1924. ilfidfid? JAMES E. STEWART, F MARY'VILLE, MISSOURI, ASSEGNOR OF ONE-THIRDT0 L. H. L'UDWIG, OF KANSAS CITY, MISS'OUEI, AND ONE-THIRD TO HERBERT L.RAINES, OF MARYVILLE, MISSOURI.

CHUCK FOR JEWELEBEJ LATHES.

Application filed May 15, 1922. Serial No. 561,194.

To all whom it may concern: or ring portion 3, and a pair of diametric-Be it known that I, JAMns E. STEWART, a ally-opposite portions 4:connecting the rear citizen of the United States, and resident of andfront portions, the construction de- Maryville, county of Nodaway, Stateof scribed comprising a head which is of skele- Missouri, have inventeda certain new and ten form as well as hollow so that the work usefulImprovement in Chucks for Jewelers can be more readily inserted and keptunder Lathes, of which the following is a complete observation.specification. V The stem and the rear portion of the head Thisinvention relates to chucks and more are formed with a centrallongitudinal bore especially to chucks for jewelerslathes, my 5 whereinfits a reversible pump center 6, object being to produce a simpleinexpensive the same being provided at one end as cuschuck by which itis possible to quickly and toinary with an axial socket 7. It is alsoaccurately center watch staffs and the like provided at its opposite endwith an axial preparatory to repair thereof or for any pointed end 8 andadjacent the same is other purpose. threaded so that when the pointedend is With this general object in view the innot in use itmay beenclosed by a projecting vention consists in certain novel and usefulcap 9 screwed upon the threaded portion.

features of construction and combinations Near its opposite ends thepump center is of parts as hereinafter described and formed withflattened faces 10 andll with claimed; and in order that it may be fullyeither of which an eccentric clamping rod understood, reference is to behad to the ac- 12 mounted in the stem is adapted to engage com anvindrawin in which for holdin the yum center ri 'idl in the v 0 Figure 1 isa side elevation of a chuck enidesired position, theurod having a handle10 bodying the invention; for convenience of operation.

Figure 2 is a central vertical longitudinal To close the open end of'thehollow head, section of the chuck, but showing certain a front plate 1lis provided, the same havclamping elements thereof in side elevation;ing a raised central or body portion and -Figure 3 isa front view of thechuck; being formed in the center thereof with an 1 Figure 4: is ahorizontal longitudinal secorifice 15 for a purpose which willhereintion of a fragment of the chuck with the after appear. It is alsoprovided in its edges pump center reversed in position to centralwithdiainetrically-opposite notches 16. At

ize the front plate on the chuck; diametrically opposite sides the headis Figure 5 is a section taken on the line formed with longitudinaldove-tail grooves VV of Figure 2; 17 for registration with the notches16 in the Figure 6 is a detail perspective view of front plate, and therear portion of the head one of the slide clamps of slightly modified iscircumferentially threaded as at 18 for enconstruction from that shownin the precedgagement by a knurled-nut 19.

ing figures; 1 I A pair of slides for clamping the front Figure 7 is afront view of a'different plate 14: rigidly in position, comprise rearform of the chuck construction; and portions 20 and front headedportions 22 Figure 8 is a View partly in side elevaextending through thenotches ofthe head,

tion and artl in section of the constructhe aortions 2O en a 'in therooves with a .1 a 2: a: e:

tion shown by Figure 7. dove-tail relation and being provided in 7Referring to the drawing in detail, where their outer faces withtransverse channels like reference characters identify corrc- 21 toreceive the knurled nut 19 so that when spending parts, 1 indicates thestem of a the latter is turned to move forward or rearchuck for jewelerslatlies and the like, proward on the threaded head, corresponding videdat its front end with a hollow head GHElWlSQ-EDOVGIHGIEShall be impartedto the comprising a rear or disc portion 2, a front slides, to cause theheads thereof to move forward from or rearward toward the front plate.in Figures 1 to 5 inclusive, the front portions of the slides arepivoted as at to the rear portions, and springs 2e hold the frontportions yieldingly in the grooves 12'. in Figure (3, the slides will beresilient so that the front portions can have a corresponding or hingemovement relative to the rear portions. In both constructions, it willbe obvious that rotative movement of the nut 19 is employed to cause theheads of the slides to clamp the front plate rigidly in position uponthe chuck head, and that sui'iicient reverse movement of the nut will remove the pressure of the slide heads from the clamp plate and permitsaid heads or one of them, to be swung outward suiiciently to permit ofthe quick and easy removal of the front plate.

In the construction shown by Figures 7 and 8, the front plate Llissecured in position by headed bolts extending through the notches l6 andinto threaded sockets 26 formed in the ring portion 3 of the head, thenotches 16 being sufficiently large as is true also in the constructionpreviously described, to permit of slight adjustments of the front plateto center the orifice thereof axially of the stem preliminary toscrewing the bolts 25 tightly in position. The re moval of one bolt 25and the partial unscrewing of the other provides for the quick removalof the front plate.

Assuming that it is desired to place the front plate in proper positionwith respect to the axial center of the chuck, the pump center isarranged in the latter as indicated by Figure The front plate is thenfitted a 'ainst the front end of the head with its orifice receiving thepointed end 8 of the pump center. The front plate is then clamped firmlyin position by turning the nut 19 or the bolts 25 as the case may be.The pump center is then removed and reversed so as to dispose itssocketed end in the head as indicated by Figure 2. A watch staff or thelike is then arranged in the head with one pivot end in the socketed endof the pump center and the other end fitting in the orifice of the plate14. The pump center is then clamped firmly in position by means of theclamp 12 and a drill as indicated at 27, may be employed to drill asocket in the front end of the staff for the reception of a pivot totake the place of the pivot end of the staff which it is assumed, hasbeen broken off and needs replacing.

It is desirable that the front plate shall be made as thin as possibleand perfectly fiat, as a great many large size balances are arranged soclose to the top of the staff that the wheel will ride on its rim beforethe pivot reaches the orifice in the front plate. It is desirable tohave the central portion of said plate raised because the provision ofnotches in the margin or flange will not weaken the plate to the sameextent as would be the case if the plate lacked the raised portion.After the repair has been made, the clamping pressure on the plate canbe relaxed as hereinbefore explained, to permit the plate to be removedor drop out.

From the above description it will be apparent that l have produced achuck en1- b dying the feature of advantage set forth as desirable inthe statementof the object of the invention, and which is susceptible ofmodification in minor particulars without departing from the principleof con struction and mode of operation involved.

I claim:

1. A chuck having a stem provided at one end with a hollow head open atits front end, a plate for fitting on the front end of the head over theopen end thereof and pro vided with a bearing orifice for axial alinement with the axis of the stem, a pump center fitting axially in thestem and axially pointed at one end for engaging with the orifice of theplate to center the same, and means for clamping the plate in place.

2. A. chuck having a stem provided at one end with a hollow head open atits front end, a plate for fitting on the front end of the head over theopen end thereof and provided with a bearing orifice for axial aline-111M116 with the axis of the stern, a reversible pump center fittingaxially in the stem and axially pointed at one end and provided with anaxial socket in its other end, means to clamp the pump center rigidly inplace, with its pointed end engaging the orifice of said plate to centerthe plate, or its socketed end at the head end of the stem in serviceposition relative to the orifice of said plate, and means for clampingsaid plate rigidly in place while its orifice is engaged by the pointedend of the pump center.

8. In a device of the character described, a stem having a hollow headopen at its front end, circumferentially threaded at its rear end andprovided with a plurality of longitudinal grooves, a plate fittingagainst the front end of the head and provided with a central orificeand marginal notches, means for centering the plate with respect to thecenter of the stem, slides fitting in the grooves of the head andnotches of the plate, having heads engaging the outer face of the plateand transverse channels adjacent the threaded portion of the head, and anut engaging the threaded head and the channels of the slides.

4. In a device of the character described, a stem having a hollow headopen at its front end, circumferentially threaded at its rear end andprovided with a plurality of longitudinal grooves, a plate fittingagainst the fr it end of the head and provided with a central orificeand marginal notches,

to the center of the stem,

the grooves slides fitting in of the head and notches of the plate,having heads engaging the outer face 5 of the plate and jacent a nuttransverse channels adthe threaded portion of the head, and

engaging the threade (1 head and the channels of the slides, said slidesbeing capable of being sprung at their front ends out of the notches ofthe plate.

In Witness whereof I hereunto aflix my signature.

JAMES E. STEWART.

